Human eyes are most sensitive to green colour. Its wavelength is approximately:

Which of the following statements are correct regarding the fovea?
$I -$ The central pit of the macula lutea is called the fovea.
$II -$ The fovea is a thinned-out portion of the retina.
$III -$ The fovea contains densely packed rods.
$IV -$ Visual acuity is highest in the fovea region.

Cone cells are sensitive to which main colors?

Analogy type question:
$(1)$ Photoreceptor cells : Cones : Dim light vision : ........
$(2)$ Eyeball contains transparent crystalline : Lens : : In front of the lens : .........

Examine the diagram of the two cell types $A$ and $B$ given below and select the correct option.

During the night,when light intensity is low,light is detected by .....